Machine for the manufacture of curled bendings at the longitudinal edges of metallic strips



B. NEGRINI Jan. v19, 1932.

1,841,758 E FOR THE MANUFACTURE OF .CURLED BENDINGS mourn AT THELONGITUDINAL EDGES 0F METALLIC STRIPS Filed Aug. 9, 1929 4 Sheets-Sheetl B. NEGRINi Jan. 19, 1932;

MACHINE FOR THE MANUFACTURE OF CURL ED BENDINGS AT THE LONGITUDINALEDGES 0F IETALLIC STRIPS Filed Aug. '9, 1929 4 Sheets-Sheet 2 B. NEGRINI1,841,758 MACHINE FOR THE MANUFACTURE OF CURLED BENDING 5 AT THELONGITUDINAL EDGES 0F IIETALLIG STRIPS Filed Aug. 9, 1929 4 Sheets-Sheet3 Jan. 19, 1932.

:J r Ll 3. ne ri'ru IV NPIIIIIVIFIIIIIIK Jan. 19, 1932. y E R 1,841,758

' MACHINE FOR THE MANUFACTURE OF CURLED BENDINGS AT THE LONGITUDINALEDGES 0F METALLIC STRIPS Filed Aug. 9. 1929 4 Sheets-Sheet 4 PatentedJan. 19, 1932 PATENT OFFICE BRUNO nnenmr, OF'IBOLOGNA, ITALY MACHINE FORTHE MANUFACTUBE OF CURIZED IBENDINGS AT THE LONG-ITUDINLAL EDGES FMETALLIC STRIPS I Application filedAugust 9, 1929, Serial No. 384,676,and in Italy January 11, 1929.

The invention refers to a machine adapted to execute by the coldprocess, curled bendings at the longitudinal edges of metallic strips.The same substantially consists of two ranges of bending rollers havinga varying profile, every one of which executes the gradual bend- 'ing ofa longitudinal edge of the fiat strip up to the required shape.

According to the invention the machine is 11? so constructed that thedistance between the two ranges of bending rollers may be changed at atime by means of a hand control so that the machine may be instantlyadjusted for operation on strips of various width.

The machine of the invention is. provided with a front train of rollersadapted for the smoothing of the strips to be curled to render it moreadapted to the bending, and is also provided with a rear train ofrollers for the final rectification of the curled strips. This lattertrain may be inclined" with respect to the axis of the strip in order tostraighten the same, which is particularly necessary in the case ofstrips having the convolutions on the opposite sides, which strips onissuing from the machine, have a tendency to become twisted.

In the drawings which show two diflerent 4 embodiments of the invention,particularly designed for the manufacturing of slats for rollershutters:

- Fig. l is aside elevational view, partly.

broken away, of the machine of the present Fig. '2 is an end elevationalView seen from thedelivery'end of the machine;

Fig. 3 is a plan. view of the machine of Figures 1 and 2 TFigures 4 andr are bent and curled by twelve subsequent;

pairs of'bending rollers;

I Figures 7 and 8 are a side view and a plan view respectively of themachine in which is adgpte'd' another form of bendmg rollers;

- side view respectively of a machine with the 5 show the bendingrollers I in asideand end view respectively as they are gures 9 and 10are an end and a partial bending rollers according toFigures 7 and 8.

In these drawings 1 is a frame on which are supported two groups ofbending rollers formed of pairs 2 and 3 each" of which curlsrespectively one longitudinal edge of the strip. The surfaces of eachpair of superposed rollers are shaped to give to each edge of the stripa series of subsequent bendings, so that after having passed all thepairs of bending rollers it assumes a profile as shown in Figure 6 lastillustration.

In the form of construction of the machine of Figures 1 to 5, thebending rollers 2 and 3 are positively driven by toothed wheels; thestrip is driven by the rollers across the bending machine. The rollers 3are rigidly mounted on the shafts 4 whilst the rollers 2 are keyed onsaid shafts, so as to allow their axial displacement, which is impartedthem by the disk 5. which is in engagement with their peripheral grooves6. The disk 5 is mounted on the threaded rod 7 screwed in the threadedsleeve 8 rotatably arranged in the frame 1 and integral with the wormwheel 9. The worm wheel 9 is driven by the worm 10. The different worms10 are mounted on one shaft 11 parallel to the side of the machine, andwhich may be operated through a pair of bevel gears 12 by a handwheel13. It is obvious that in rotating the shaft 11 an axial displacement ofthe disks 5 will be effected with a contemporaneous entrainment ofrollers 2.

In the form of'construction shown in Figures 7 to 10, the bendingrollers 2 and 3, the

distance of which gradually decreases towards the discharge end ofthemachine, areloosely mounted on the vertical shafts 14 fastened on thesides 15 and 15' of the machine; the strips are advanced by thesuperposed feed rollers 16 and 17. The rollers 17 are provided withsleeves 19 keyed on the shafts 18 so as to be axially movable on thesame. These sleeves are rotatably mounted in the side 15 and presentcollars 20, which collars, in displacin the side 15" towards the rightor towards t e left, take with it the sleeve. The side 15 is slidableupon guides 40 and may be displaced by the interposition of the threadedbolts 21 screwed in the corresponding taps of the side; these threadedbolts are formed as it is the case in the first example, one piece withthe worm wheel 22, engaged with a worm 23, and these different worms aremounted on a single shaft 24, which can be rotated through a pair ofbevel wheels 25 by a hand wheel 26. These means allow also in this casethe instantaneous adjustment of the machine side, in order to supplywith convolutionsmetal strips of different width.

The machine according to the invention is also provided with apreliminary strai htening device which straightens the strip before itsadmission to the machine in rendering it at the same time more flexiblefor the bending operation. This device consists in a group of lowerrollers 27, the axes of which are complanary, and in a group of upperrollers 28,

I which are parallel to the lower ones'and adj ustable in the verticaldirection by connecting with the rods 29 with the excentric disks 30.This straightening device is further supplied with an independent roller31, by which the final adjustment of the strip is effected before itsentrance into the bending mill.

The machine is further supplied with a subsequent straightening deviceto straighten the strip already supplied with Volutes. This devicepresents a frame 32, fastened upon the main frame 1 of the bendingmachine, and

\ carries lower rollers 33 and upper rollers 34,

which have the shape of the strip supplied.-

with volutes. In this device the upper rollers can be adjustedvertically with respect to the lower rollers, so as to enable theexertion of pressure required upon the strip. The-frame 32 can also berotated around an axis corresponding with the axis of the strip; forthis purpose the frame 32 is fastened upon the frame 1 by threaded bolts35 which penetrate cuts 36 upon the frame 32.

The drive of the machine is accomplished by means of the shaft 37, whichcarries the bevel gears 38 engagedwith the bevel gears 39 keyed on theshafts 4.

I claim 1. In a machine for the manufacture of curled bendings along thelongitudinal edges of metal strips, a section for the preliminarystraightening of the blank, anintermediate section for the cold bendingof the edges and a section for the final straightening of the metalstrip supplied with bendings, the section for the bending being composedof two groups of bending rollers of variable profile, one roup of whichis arranged in correspon ence with one edgeof the strip to be fedstraightening of the blank, an intermediate stantaneous adjustment ofone group of bending rollers with respect to the rollers of the othergroup.

3. Amachine according to claim 2, characterized in'this, that each groupof bending rollers consists in a number of roller pairs with twosuperposed rollers per pair, these roller pairs besides bending thestrip also effect the feeding of the strip through the machine.

4. In a machine for the manufacture of curled bendings along thelongitudinal edges of metal strips, special feed rollers for feeding thestrips through the machine, a section for the preliminary straighteningof the blank, an intermediate section for the cold bending of the edgesand a section that can be rotated and adjusted with regard to the axisof the strip for the final straightening of the metal strip with curlededges, the section for bending and curling the edges of the metal stripsbeing composed of vertical shafts and two groups of single bendingrolers of variable profile, loosely mounted upon said vertical shafts,one group of said rollers being arranged in correspondence to one edgeof the strip to be fed through the machine and a hand control associatedwith the other group of bending rollers on the machine frame so as toefiect the simultaneous adjustment thereof with regard to the rollers ofthe BRUNO NEGRIINI.

through the machine and a hand Wheel arranged on the machine frame toeffect contemporaneous instantaneous adjustment of one group of bendingrollers with respect to the rollers of the other group.

2. In a machine for the manufacture of curled bendings along thelongitudinal edges of metal strips, a section'for the preliminary

